Check Safety Controls - Bryant C Series Installation, Start-Up, And Operating Instructions Manual

TABLE 7—GAS RATE CU FT/HR
SECONDS SIZE OF TEST DIAL
FOR 1 1 2 5
REVOLUTION cu ft cu ft cu ft
10 360 720 1800
11 327 655 1636
12 300 600 1500
13 277 555 1385
14 257 514 1286
15 240 480 1200
16 225 450 1125
17 212 424 1059
18 200 400 1000
19 189 379 947
20 180 360 900
21 171 343 857
22 164 327 818
23 157 313 783
24 150 300 750
25 144 288 720
26 138 277 692
27 133 267 667
28 129 257 643
29 124 248 621
30 120 240 600
31 116 232 581
32 113 225 563
33 109 218 545
34 106 212 529
35 103 206 514
36 100 200 500
37 97 195 486
38 95 189 474
39 92 185 462
40 90 180 450
41 88 176 439
42 86 172 429
43 84 167 419
44 82 164 409
45 80 160 400
46 78 157 391
47 76 153 383
48 75 150 375
49 73 147 367
WARNING: Disconnect the electrical power before
changing the speed tap. Failure to follow this warning
could result in personal injury.
d. To change motor speed taps, remove the motor tap lead
and relocate it on the desired terminal on the plug-in
terminal block/speed selector located on the blower
housing. (See Table 9.)
TABLE 8—CANADIAN ORIFICE SIZE
SEA LEVEL
GAS
0—2000
Natural 44
Propane 54
TABLE 9—SPEED SELECTOR
SPEED
Common
High
Med-High
Med-Low
Low
* White wire from control box to common; black wire from control box to cooling
speed selection; red wire from control box to heating and constant fan speed
selection.
SECONDS SIZE OF TEST DIAL
FOR 1 1 2 5
REVOLUTION cu ft cu ft cu ft
50 72 144 360
51 71 141 355
52 69 138 346
53 68 136 340
54 67 133 333
55 65 131 327
56 64 129 321
57 63 126 316
58 62 124 310
59 61 122 305
60 60 120 300
62 58 116 290
64 56 112 281
66 54 109 273
68 53 106 265
70 51 103 257
72 50 100 250
74 48 97 243
76 47 95
237
78 46 92 231
80 45 90 225
82 44 88 220
84 43 86 214
86 42 84 209
88 41 82 205
90 40 80 200
92 39 78 196
94 38 76 192
96 38 75 188
98 37 74 184
100 36 72 180
102 35 71 178
104 35 69 173
106 34 68 170
108 33 67 167
110 33 65 164
112 32 64 161
116 31 62 155
120 30 60 150
HIGH ALTITUDE
2001—4500 FT
45
55
TAP NO.*
C
1
2
3
4
CAUTION: Recheck the temperature rise. It must be
within the limits specified on the unit rating plate.
Recommended operation is at midpoint of rise or above.
3. Set thermostat heat anticipator.
The thermostat heat anticipation must be set to match the
amp draw of the electrical components in the R-W circuit.
Accurate amp draw readings can be obtained at thermostat
subbase terminals R and W. Fig. 14 illustrates an easy
method of obtaining the actual amp draw. The amp reading
should be taken after the blower motor has started. See the
thermostat manufacturer's instructions for adjusting the
heat anticipator and for varying the heating cycle length.
NOTE: When using an electronic thermostat, set cycle rate for 3
cycles per hr.
Fig. 14—Amp Draw Check With Ammeter
E. Check Safety Controls
1. Check operation of gas shut-off control for 100 percent
shutoff.
NOTE: The furnace pilot must be lit so the thermocouple 5.0 AMPS ON AMMETER
EXAMPLE:
10 TURNS AROUND JAWS
energizes the thermal magnet circuit of gas valve GV, which
permits gas flow to the remaining portion of the valve.
If the pilot flame is extinguished, the thermocouple will no
longer energize the thermal magnet circuit of the gas valve.
Gas flow to the pilot and main burners will cease until the
pilot is manually relit.
a. With furnace operating, unscrew pilot thermocouple lead
from gas valve. The pilot and main burner gas must shut
off. No gas should flow through valve.
b. After valve is found to operate satisfactorily, reconnect
thermocouple to gas valve (fingertight position only).
c. Tighten thermocouple connection 1/4 turn with wrench.
d. Relight pilot by following lighting instructions on the
furnace.
2. Check primary limit control.
This control shuts off the combustion control system and
energizes the circulating-air blower motor if the furnace
overheats.
The preferred method of checking the limit control is to
gradually block off the return air after the furnace has been
operating for a period of at least 5 minutes. As soon as the
limit has shut off the burners, the return-air opening should
be unblocked. By using this method to check the limit
control, it can be established that the limit is functioning
properly and will operate if there is a motor failure.
3. Check draft safeguard switch.
—12—
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
HOOK-AROUND
VOLT/AMMETER
R Y W G
10 TURNS
FROM UNIT 24-VOLT
TERMINAL BLOCK
= 0.5 AMPS FOR THERMOSTAT SETTING
A80201